中文标题：Ce改性介孔γ-Al2O3负载Pd-Pt纳米晶催化剂的制备及其在苯催化燃烧性能中的构效关系
英文标题：Ce-modified mesoporous γ-Al2O3 supported Pd-Pt nanoparticle catalysts and their structure-function relationship in complete benzene oxidation
刊物名称及期号、页码：Chem. Eng. J. 2019, DOI: 10.1016/j.cej.2018.09.040
作者姓名（中文）：陈珠，李静，杨鹏，成珍，李敬荣，左树锋
作者姓名（英文）：Zhu Chen, Jing Li, Peng Yang, Zhen Cheng, Jingrong Li, Shufeng Zuo
摘要（英文）：In this investigation, a mesoporous γ-Al2O3 with large surface area and good thermal stability was synthesized and employed as the support for preparing a series of Pd-Pt nanocrystalline catalysts by using a high-temperature solution-phase reduction method. The PdOx (x = 0, 1) and PtOx (x = 0, 2) nanoparticles were found to have a small diameter (about 2 nm) and were highly dispersed on the surface of the mesoporous γ-Al2O3. The results show that catalysts with the appropriate ceria greatly improved the physical adsorption/chemisorption of benzene to Pd-Pt nanocrystals, which greatly enhanced the activity to achieve the complete oxidation of benzene. The high activity of the catalyst was mainly due to the nano-effects of Pd-Pt nanocrystals and the interactions among the active components. 0.2%Pd-Pt(1:1)/10%Ce/γ-Al2O3 demonstrated the best activity for the complete oxidation of benzene at 200 °C. Furthermore, this catalyst maintained 95% benzene conversion for 1000 h at 190 °C and displayed good resistance to water and Cl-poisoning, which indicated that the Pd-Pt nanocrystalline catalysts have promise for adoption by the industry.
工作简介：消除VOCs的最有效方法之一是催化燃烧法，在催化方面，贵金属（例如：Pd和Pt）比其他金属氧化物具有更高的活性和更低的起燃温度，但由于其成本价格高昂和易于中毒等问题，限制了其广泛应用。因此，制备一系列低负载量、高活性和良好耐久性的贵金属纳米晶催化剂具有良好的前景。传统制备负载型贵金属催化剂的方法有浸渍法和共沉淀法等，但这些方法很难控制活性组分的分散度及颗粒大小。因此，从实际应用角度考虑，通过改变制备方法来开发一种低负载量、高活性且具有优异耐久性的负载型贵金属催化剂已成为该领域进一步发展的迫切任务。
基于此，该课题组利用乙二醇为还原剂，通过控制反应温度和反应时间制备了一系列贵金属纳米晶催化剂，其中Pd-Pt(1:1)/10％Ce/γ-Al2O3在200℃时表现出催化燃烧苯的最佳活性。PdOx（x = 0，1）和PtOx（x = 0，2）纳米颗粒尺寸约2-3 nm，并高度分散在介孔γ-Al2O3的表面上。利用高温液相还原法制备所得催化剂具有低负载量、高活性和良好耐久性能等特点。
创新点：发展了一种制备一系列低贵金属负载量、粒径小、高分散的Pd-Pt纳米晶催化剂的新方法。
全文链接：https://doi.org/10.1016/j.cej.2018.09.040
